"of or pertaining to psi in the 'paranormal' sense," 1952, from psi + ending from electronic, etc. First attested in science fiction. Related: Psionics.
23rd letter of the Greek alphabet. Its use for "psychic force, paranormal phenomenon" dates from 1942 (probably from psychic (adj.)).
1901, "pertaining to electrons;" see electron + -ic; 1930 as "pertaining to electronics." Related: Electronically.
updated on January 18, 2021